Pure Music2.0.4

Added alerts to remind when quitting Pure Music to reduce the volume in the streaming source ap- plication (when the default setting of Automatically Activate Streamthrough is used) to avoid a po- tentially loud playback volume setting when the default system sound device is restored to its original setting

Minor cosmetic change to UI (prevent resizing vertically)

Minor change to startup sequence eliminated issue which prevented automatic Streamthrough from working, if using a DSD DoP DAC